Brown meat; drain.,Stir in tomato sauce and seasoning mix. Simmer 5 minutes.,Press dough onto bottom of ungreased 9 x 12-inch pan, pressing edges together to form seal.,______,Bake at 375° for 10 to 12 minutes or until golden brown.,Cover with meat mixture; top with cheese slices.,Continue baking until cheese begins to melt.,Top with remaining ingredients.,Serve with sour cream if desired.